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https://issues.apache.org/jira/browse/FLINK-32940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17757993#comment-17757993
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Jark Wu commented on FLINK-32940:
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[~337361...@qq.com] do you have time to help take a look?
> Support projection pushdown to table source for column projections through
> UDTF
> -------------------------------------------------------------------------------
>
> Key: FLINK-32940
> URL: https://issues.apache.org/jira/browse/FLINK-32940
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Reporter: Venkata krishnan Sowrirajan
> Priority: Major
>
> Currently, Flink doesn't push down columns projected through UDTF like
> _UNNEST_ to the table source.
> For eg:
> {code:java}
> select t1.name, t2.ename from DEPT_NESTED as t1, unnest(t1.employees) as
> t2{code}
> For the above SQL, Flink projects all the columns for DEPT_NESTED rather than
> only _name_ and {_}employees{_}. If the table source supports nested fields
> column projection, ideally it should project only _t1.employees.ename_ from
> the table source.
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